Underhill Formation, Jay Peak Member (VTCAuj;0)

State	Vermont
Name	Underhill Formation, Jay Peak Member
Geologic age	Cambrian
Original map label	Cuj
Comments	Part of Green Mountains, Camels Hump Group The Underhill lies stratigraphically above basement rocks of Mount Holly Complex of Grenville (1 b.y.) age. Age changed to Late Proterozoic and(or) Early Cambrian (Slack and others, 1988) per VT020.
Primary rock type	mica schist
Secondary rock type	quartzite
Other rock types
Lithologic constituents	Major Metamorphic > SchistPale, silver-green, quartz-sericite-chlorite-albite schist, locally quartzitic. Incidental Metamorphic > Metasedimentary > Metaclastic > QuartzitePale, silver-green, quartz-sericite-chlorite-albite schist, locally quartzitic.
Map references	Nicholson, S.W., Dicken, C.L., Horton, J.D., Foose, M.P., Mueller, J.A.L., and Hon, Rudi, 2006, Preliminary integrated geologic map databases for the United States: Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, Rhode Island, and Vermont: U.S. Geological Survey Open-File Report 2006-1272. [http://pubs.er.usgs.gov/publication/ofr20061272]
Unit references	Doll, C.G., Cady, W.M., Thompson, J.B., Jr., and Billings, M.P., 1961, Centennial Geologic Map of Vermont: Vermont Geological Survey, Miscellaneous Map MISCMAP-01, scale 1:250,000. Slack, J.F., Atelsek, P.H. and Grosz, A.E., 1988, Geology and geochemical survey of the Bristol Cliffs Wilderness, Addison County, Vermont: U.S. Geological Survey Miscellaneous Field Studies Map, MF-1593-A, 1 sheet, scale 1:24,000. [http://pubs.er.usgs.gov/publication/mf1593A]
Geographic coverage	Orleans